Shure SCL5 Sound-Isolating Earphone with Dual High-Definition Driver Earphones with Dedicated Tweeters/Woofers and In-line Crossover, Clear Frequency Range: 20Hz  18.5kHz Sensitivity: 122dB SPL/mW Impedance:110 Ohms Input Connector: 3.5mm (1/8) Cable Length: 155 cm (61)